keep the air circulating and use febreeze
"The musty smell of the attic filled my nostrils" BWHAHAHAHAHAHAH
The first step to getting a musty smell out of a closed up house is to open the windows. You will also want to burn some candles. Spraying Lysol will also help get rid of the musty smell.
The musty smell that Brian notices when he wakes up is caused by the dampness and mold growth in the shelter. The combination of moisture and lack of ventilation can create a musty odor.
Bleach
you wash it????
Vinegar
wash everything and febreze...
if it smells musty, try leaving the door open so it will dry quicker we have a duet front-loader, and it will smell musty if we leave the door shut, so we leave it open for an hour or two after washing clothes to let it dry out
try using an air freshener
A "musty" smell would describe a damp animal
It can be a sign of mildew or mold.
It is most likely from mold in and/or under your upholstery.